Fluid-gage.



No. '794,676- PATENTED JULY ll, 1905.

M. MARTIN.

FLUID GAGE.

APPLIOATION FILED MAE. l',A 1905.

2f M RL in which is located the compass-box.

UNITED STATES Patented July 11, 1905.

PATENT OEEICE.

MORRIS MARTIN, OE MALDEN, MASSACHUSETTS, ASSIGNOR TO GEORGE W. GREGORY, TRUSTEE, OF BOSTON, MASSACHUSETTS.

FLUID-GAGE.

SPECIFICATION forming part of Letters Patent No. 794,676, dated July 11, 1905.

i l Application filed March l, 1905. Serial No. 247,841.

,nying drawings, is a specification, like letters on the drawings representing like parts.

This invention has for its object the production of a novel fluid-gage adapted to' be applied to a bushing on a tank to close the same air-tight.

My novel gage comprises a head threaded at one end to be connected with said bushing, said head having a chamber at its upper end, A glass cover is laid on the compass-box, and means Vthereto gas and iiuid tight.

(shown as a ring-nut) is applied to the Lipper end of said head to hold said compass-box in any position in which it may be adjusted in said head. The bushing is threaded and has a shoulder on which rests the projecting edge of a plate secured to one end of a slotted tube to sustain said tube. The tube has a' shaft provided with a float that coacts with a floatguide which turns the float, the latter turning and rotating a magnet at the upper end of said tube.

Figure l shows one of my gages, mostly in section, the same resting upon a part of a tank. Fig. 2 is a plan view of the head of the gage. Fig. 3 represents part of the lower end of the tube to show its saw cut.

The tank A,the top onlyof which is shown and made to sustain my novel gage, is provided with a bushing B, which is secured The bushing has an inward shoulder ZJ. The headCof the gage has its outer end c and its inner end c reduced in diameter, and the portion c2 of the gage between its outer and inner ends is provided with a plurality of at faces, (shown by dotted lines, Fig. 2,) to be engaged by a wrench when securing the head to the bushing. The outer and inner ends of the bushing are chambered, and as shown each of the ends is threaded externally. The tube D,

provided With'a spiral guideway d, has connected with it at one end a plate D, the perimeter of which is extended outwardly, presenting a flange that rests on the shoulder when the tube is dropped into the bushing. The tube may be turned freely in either direction in said bushing to place the magnet, to be described, so that it may stand in any desired direction diametrically with relation to the bushing. The tube at its lower end has a tinesaw cut c3, (see Fig. 3,) leading from the lower end of the slot (Z to the extremity of the 6G tube'. VThe saw cut c3 is expanded slightly when inserting the fioatf into the lower open end of the tube, the saw cut permitting the pin f of the iloat to pass through on its way into the spiral guideway d. The lower end of the tube, after the insertion of the float therein,

is provided with a cap-nut c4, that prevents the expansion of the tube and holds it securely in working position. The plate D at one end of the tube forms a bearing for a shaft g, shown as a flat ribbon of steel, and said shaft at one end is provided with a permanent magnet g, said cap forming a bearing for one end of the shaft, and the cap-nut c4 has a hole toy receive the opposite end of said shaft. The metal iioat f embraces the shaft g loosely, and

as the level of the fluid in the tank changes the float rises and falls and the pin f in the spiral guideway turns said shaft and magnet. The chamber at the upper end of the head receives a compass-box L, having rising from the bottom a pin t, on which is mounted a magnetic pointer f. This pointer is physically unconnected with said magnet, but is rotated in the chamber 05X at the lower end of 85 head C by the magnetic force of said magnet through the central wall c5 of the head and the bottom of the compass-box. The extension at the upper end of said head is shown as threaded toreceive a threaded clamping-ring G, said ring having, as shown, an inturned lip to overlie the side walls of the compassy box. The compass-box is shown as provided with a glass cover h3, which is laid on the upper edge of the side wall of the' compass-box, 95 and as the clamping-ring is screwed down in its working position the flange of the ring, acting on the plate-glass cover, forces the latter firmly against the upper edge of the compass-box and seals the chamber containing the compass-box water-tight. This same adjustment of the clamping-ring fixes the compassbox in whatever position it occupied when the clamping-ring was turned down. The compass-box is rotatable in the chamber at the upper end of the head, so that the letters E and F in the bottom ofthe compass-box may be brought, by turning the compass-box, under the arrow-head of the magnetic pointer 71,2.

With the bushing fixed to the tank the tube containing the shaft and ioat will be put into the bushing until the edge of the plate D rests on the shoulder of' the bushing. The person applying the gage may take hold of the magnet, llift the gage somewhat off the shoulderl ofl the bushing, and turn the tube to place the magnet in any desired position diametrically of the bushing, as the position of' the magnet defines the normal position of the magnetic pointer when the tank is empty. The magnet having been adjusted in the desired position, the head C will be screwed into the bushing, and when properly seated the compass-box will be placed in the chamber at the upper end of the head and the magnetic pointer h2 applied to the pin of' the compassbox. Now turn the compass-box in the chamber axially until the letter cE comesunder the arrow-head of thebpointer. Then apply the glass. cover and screw the ring-nut G onto the upper end of' the head.

Having fully described myinvention, what I claim as new, and desire to secure by Letters Patent, is-

1. In aiuid-gage, a bushing, a head detachably connected therewith and recessed at its upper side, a compass-box applied loosely in said recess that it may be adjusted axially therein, a glass entering said recess and sustained by said compass-box, and a ring secured to said head and overlapping said glass the ring seating the same on said compass-box.

2. In a uid-gage, a screw-threaded bushing to be attached to a tank, a head having a screw-threaded portion to engage the screwthreads o'l` said bushing, said head being recessed at its outer side, a compass-box set in the recess of said head, a glass cover for said compass-box, and a ring to clamp said comcess but adjustable axially therein, a cover, a

ring to confine said compass-box in its adjusted position, a magnetic pointer mounted on a pivot in said compass-box, a magnet physically unconnected with said magnetic portion and located at the inner -end of said head, a shaft Carrying said magnet, and a lioat and iioat-guide, the lioat as it rises turning said shaft and magnet, the latter revolving with it said magnetic pointer.

4. In a Huid-gage, a bushing having ashoulder at its interior, a head cham bered at its inner and outer ends, said head being adapted to be engaged with said. bushing, a tube provided with a spiral slot and provided at one vend with a plate to rest on the shoulder of said bushing, a shaft sustained in said tube, a permanent magnet connected with said shaft at one end, said magnet entering the chamber at the inner end of' said head, a iioat having' a pin and surrounding said shaft and adapted to rotate the latter and the magnet as the depth of liquid sustaining the iioat varies, a compass-box set in the outer chamber of said head, a magnetic pointer physically unconnected with saidl magnet, means for holding said compass-box in any position in which it may be adjusted in said head, the rotation of said magnet by said float turning said inagnetic pointer in unison with it.

5. In a fluid-gage, a tube having a floatguiding slot anda narrower slot leading from the end of said tubeinto the {ioat-gu'iding slot, combined with a float in said tube, said iioat having a pin fixed thereto and movable in said float-guiding slot, said pin being passed through said narrower slot into said floatguiding slot.

In testimony whereof I have signed my name to this specification in the presence of' two sub- IOO 

